[Feature] add GA346 baseline version
Change-Id: Ic62933698569507dcf98240cdf5d9931ae34348f
diff --git a/src/kernel/linux/v4.19/drivers/ata/ahci_xgene.c b/src/kernel/linux/v4.19/drivers/ata/ahci_xgene.c
new file mode 100644
index 0000000..7e157e1
--- /dev/null
+++ b/src/kernel/linux/v4.19/drivers/ata/ahci_xgene.c
@@ -0,0 +1,901 @@
+/*
+ * AppliedMicro X-Gene SoC SATA Host Controller Driver
+ *
+ * Copyright (c) 2014, Applied Micro Circuits Corporation
+ * Author: Loc Ho <lho@apm.com>
+ * Tuan Phan <tphan@apm.com>
+ * Suman Tripathi <stripathi@apm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * NOTE: PM support is not currently available.
+ *
+ */
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/ahci_platform.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/phy/phy.h>
+#include "ahci.h"
+
+#define DRV_NAME "xgene-ahci"
+
+/* Max # of disk per a controller */
+#define MAX_AHCI_CHN_PERCTR 2
+
+/* MUX CSR */
+#define SATA_ENET_CONFIG_REG 0x00000000
+#define CFG_SATA_ENET_SELECT_MASK 0x00000001
+
+/* SATA core host controller CSR */
+#define SLVRDERRATTRIBUTES 0x00000000
+#define SLVWRERRATTRIBUTES 0x00000004
+#define MSTRDERRATTRIBUTES 0x00000008
+#define MSTWRERRATTRIBUTES 0x0000000c
+#define BUSCTLREG 0x00000014
+#define IOFMSTRWAUX 0x00000018
+#define INTSTATUSMASK 0x0000002c
+#define ERRINTSTATUS 0x00000030
+#define ERRINTSTATUSMASK 0x00000034
+
+/* SATA host AHCI CSR */
+#define PORTCFG 0x000000a4
+#define PORTADDR_SET(dst, src) \
+ (((dst) & ~0x0000003f) | (((u32)(src)) & 0x0000003f))
+#define PORTPHY1CFG 0x000000a8
+#define PORTPHY1CFG_FRCPHYRDY_SET(dst, src) \
+ (((dst) & ~0x00100000) | (((u32)(src) << 0x14) & 0x00100000))
+#define PORTPHY2CFG 0x000000ac
+#define PORTPHY3CFG 0x000000b0
+#define PORTPHY4CFG 0x000000b4
+#define PORTPHY5CFG 0x000000b8
+#define SCTL0 0x0000012C
+#define PORTPHY5CFG_RTCHG_SET(dst, src) \
+ (((dst) & ~0xfff00000) | (((u32)(src) << 0x14) & 0xfff00000))
+#define PORTAXICFG_EN_CONTEXT_SET(dst, src) \
+ (((dst) & ~0x01000000) | (((u32)(src) << 0x18) & 0x01000000))
+#define PORTAXICFG 0x000000bc
+#define PORTAXICFG_OUTTRANS_SET(dst, src) \
+ (((dst) & ~0x00f00000) | (((u32)(src) << 0x14) & 0x00f00000))
+#define PORTRANSCFG 0x000000c8
+#define PORTRANSCFG_RXWM_SET(dst, src) \
+ (((dst) & ~0x0000007f) | (((u32)(src)) & 0x0000007f))
+
+/* SATA host controller AXI CSR */
+#define INT_SLV_TMOMASK 0x00000010
+
+/* SATA diagnostic CSR */
+#define CFG_MEM_RAM_SHUTDOWN 0x00000070
+#define BLOCK_MEM_RDY 0x00000074
+
+/* Max retry for link down */
+#define MAX_LINK_DOWN_RETRY 3
+
+enum xgene_ahci_version {
+ XGENE_AHCI_V1 = 1,
+ XGENE_AHCI_V2,
+};
+
+struct xgene_ahci_context {
+ struct ahci_host_priv *hpriv;
+ struct device *dev;
+ u8 last_cmd[MAX_AHCI_CHN_PERCTR]; /* tracking the last command issued*/
+ u32 class[MAX_AHCI_CHN_PERCTR]; /* tracking the class of device */
+ void __iomem *csr_core; /* Core CSR address of IP */
+ void __iomem *csr_diag; /* Diag CSR address of IP */
+ void __iomem *csr_axi; /* AXI CSR address of IP */
+ void __iomem *csr_mux; /* MUX CSR address of IP */
+};
+
+static int xgene_ahci_init_memram(struct xgene_ahci_context *ctx)
+{
+ dev_dbg(ctx->dev, "Release memory from shutdown\n");
+ writel(0x0, ctx->csr_diag + CFG_MEM_RAM_SHUTDOWN);
+ readl(ctx->csr_diag + CFG_MEM_RAM_SHUTDOWN); /* Force a barrier */
+ msleep(1); /* reset may take up to 1ms */
+ if (readl(ctx->csr_diag + BLOCK_MEM_RDY) != 0xFFFFFFFF) {
+ dev_err(ctx->dev, "failed to release memory from shutdown\n");
+ return -ENODEV;
+ }
+ return 0;
+}
+
+/**
+ * xgene_ahci_poll_reg_val- Poll a register on a specific value.
+ * @ap : ATA port of interest.
+ * @reg : Register of interest.
+ * @val : Value to be attained.
+ * @interval : waiting interval for polling.
+ * @timeout : timeout for achieving the value.
+ */
+static int xgene_ahci_poll_reg_val(struct ata_port *ap,
+ void __iomem *reg, unsigned
+ int val, unsigned long interval,
+ unsigned long timeout)
+{
+ unsigned long deadline;
+ unsigned int tmp;
+
+ tmp = ioread32(reg);
+ deadline = ata_deadline(jiffies, timeout);
+
+ while (tmp != val && time_before(jiffies, deadline)) {
+ ata_msleep(ap, interval);
+ tmp = ioread32(reg);
+ }
+
+ return tmp;
+}
+
+/**
+ * xgene_ahci_restart_engine - Restart the dma engine.
+ * @ap : ATA port of interest
+ *
+ * Waits for completion of multiple commands and restarts
+ * the DMA engine inside the controller.
+ */
+static int xgene_ahci_restart_engine(struct ata_port *ap)
+{
+ struct ahci_host_priv *hpriv = ap->host->private_data;
+ struct ahci_port_priv *pp = ap->private_data;
+ void __iomem *port_mmio = ahci_port_base(ap);
+ u32 fbs;
+
+ /*
+ * In case of PMP multiple IDENTIFY DEVICE commands can be
+ * issued inside PxCI. So need to poll PxCI for the
+ * completion of outstanding IDENTIFY DEVICE commands before
+ * we restart the DMA engine.
+ */
+ if (xgene_ahci_poll_reg_val(ap, port_mmio +
+ PORT_CMD_ISSUE, 0x0, 1, 100))
+ return -EBUSY;
+
+ hpriv->stop_engine(ap);
+ ahci_start_fis_rx(ap);
+
+ /*
+ * Enable the PxFBS.FBS_EN bit as it
+ * gets cleared due to stopping the engine.
+ */
+ if (pp->fbs_supported) {
+ fbs = readl(port_mmio + PORT_FBS);
+ writel(fbs | PORT_FBS_EN, port_mmio + PORT_FBS);
+ fbs = readl(port_mmio + PORT_FBS);
+ }
+
+ hpriv->start_engine(ap);
+
+ return 0;
+}
+
+/**
+ * xgene_ahci_qc_issue - Issue commands to the device
+ * @qc: Command to issue
+ *
+ * Due to Hardware errata for IDENTIFY DEVICE command, the controller cannot
+ * clear the BSY bit after receiving the PIO setup FIS. This results in the dma
+ * state machine goes into the CMFatalErrorUpdate state and locks up. By
+ * restarting the dma engine, it removes the controller out of lock up state.
+ *
+ * Due to H/W errata, the controller is unable to save the PMP
+ * field fetched from command header before sending the H2D FIS.
+ * When the device returns the PMP port field in the D2H FIS, there is
+ * a mismatch and results in command completion failure. The
+ * workaround is to write the pmp value to PxFBS.DEV field before issuing
+ * any command to PMP.
+ */
+static unsigned int xgene_ahci_qc_issue(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ struct ahci_host_priv *hpriv = ap->host->private_data;
+ struct xgene_ahci_context *ctx = hpriv->plat_data;
+ int rc = 0;
+ u32 port_fbs;
+ void *port_mmio = ahci_port_base(ap);
+
+ /*
+ * Write the pmp value to PxFBS.DEV
+ * for case of Port Mulitplier.
+ */
+ if (ctx->class[ap->port_no] == ATA_DEV_PMP) {
+ port_fbs = readl(port_mmio + PORT_FBS);
+ port_fbs &= ~PORT_FBS_DEV_MASK;
+ port_fbs |= qc->dev->link->pmp << PORT_FBS_DEV_OFFSET;
+ writel(port_fbs, port_mmio + PORT_FBS);
+ }
+
+ if (unlikely((ctx->last_cmd[ap->port_no] == ATA_CMD_ID_ATA) ||
+ (ctx->last_cmd[ap->port_no] == ATA_CMD_PACKET) ||
+ (ctx->last_cmd[ap->port_no] == ATA_CMD_SMART)))
+ xgene_ahci_restart_engine(ap);
+
+ rc = ahci_qc_issue(qc);
+
+ /* Save the last command issued */
+ ctx->last_cmd[ap->port_no] = qc->tf.command;
+
+ return rc;
+}
+
+static bool xgene_ahci_is_memram_inited(struct xgene_ahci_context *ctx)
+{
+ void __iomem *diagcsr = ctx->csr_diag;
+
+ return (readl(diagcsr + CFG_MEM_RAM_SHUTDOWN) == 0 &&
+ readl(diagcsr + BLOCK_MEM_RDY) == 0xFFFFFFFF);
+}
+
+/**
+ * xgene_ahci_read_id - Read ID data from the specified device
+ * @dev: device
+ * @tf: proposed taskfile
+ * @id: data buffer
+ *
+ * This custom read ID function is required due to the fact that the HW
+ * does not support DEVSLP.
+ */
+static unsigned int xgene_ahci_read_id(struct ata_device *dev,
+ struct ata_taskfile *tf, u16 *id)
+{
+ u32 err_mask;
+
+ err_mask = ata_do_dev_read_id(dev, tf, id);
+ if (err_mask)
+ return err_mask;
+
+ /*
+ * Mask reserved area. Word78 spec of Link Power Management
+ * bit15-8: reserved
+ * bit7: NCQ autosence
+ * bit6: Software settings preservation supported
+ * bit5: reserved
+ * bit4: In-order sata delivery supported
+ * bit3: DIPM requests supported
+ * bit2: DMA Setup FIS Auto-Activate optimization supported
+ * bit1: DMA Setup FIX non-Zero buffer offsets supported
+ * bit0: Reserved
+ *
+ * Clear reserved bit 8 (DEVSLP bit) as we don't support DEVSLP
+ */
+ id[ATA_ID_FEATURE_SUPP] &= cpu_to_le16(~(1 << 8));
+
+ return 0;
+}
+
+static void xgene_ahci_set_phy_cfg(struct xgene_ahci_context *ctx, int channel)
+{
+ void __iomem *mmio = ctx->hpriv->mmio;
+ u32 val;
+
+ dev_dbg(ctx->dev, "port configure mmio 0x%p channel %d\n",
+ mmio, channel);
+ val = readl(mmio + PORTCFG);
+ val = PORTADDR_SET(val, channel == 0 ? 2 : 3);
+ writel(val, mmio + PORTCFG);
+ readl(mmio + PORTCFG); /* Force a barrier */
+ /* Disable fix rate */
+ writel(0x0001fffe, mmio + PORTPHY1CFG);
+ readl(mmio + PORTPHY1CFG); /* Force a barrier */
+ writel(0x28183219, mmio + PORTPHY2CFG);
+ readl(mmio + PORTPHY2CFG); /* Force a barrier */
+ writel(0x13081008, mmio + PORTPHY3CFG);
+ readl(mmio + PORTPHY3CFG); /* Force a barrier */
+ writel(0x00480815, mmio + PORTPHY4CFG);
+ readl(mmio + PORTPHY4CFG); /* Force a barrier */
+ /* Set window negotiation */
+ val = readl(mmio + PORTPHY5CFG);
+ val = PORTPHY5CFG_RTCHG_SET(val, 0x300);
+ writel(val, mmio + PORTPHY5CFG);
+ readl(mmio + PORTPHY5CFG); /* Force a barrier */
+ val = readl(mmio + PORTAXICFG);
+ val = PORTAXICFG_EN_CONTEXT_SET(val, 0x1); /* Enable context mgmt */
+ val = PORTAXICFG_OUTTRANS_SET(val, 0xe); /* Set outstanding */
+ writel(val, mmio + PORTAXICFG);
+ readl(mmio + PORTAXICFG); /* Force a barrier */
+ /* Set the watermark threshold of the receive FIFO */
+ val = readl(mmio + PORTRANSCFG);
+ val = PORTRANSCFG_RXWM_SET(val, 0x30);
+ writel(val, mmio + PORTRANSCFG);
+}
+
+/**
+ * xgene_ahci_do_hardreset - Issue the actual COMRESET
+ * @link: link to reset
+ * @deadline: deadline jiffies for the operation
+ * @online: Return value to indicate if device online
+ *
+ * Due to the limitation of the hardware PHY, a difference set of setting is
+ * required for each supported disk speed - Gen3 (6.0Gbps), Gen2 (3.0Gbps),
+ * and Gen1 (1.5Gbps). Otherwise during long IO stress test, the PHY will
+ * report disparity error and etc. In addition, during COMRESET, there can
+ * be error reported in the register PORT_SCR_ERR. For SERR_DISPARITY and
+ * SERR_10B_8B_ERR, the PHY receiver line must be reseted. Also during long
+ * reboot cycle regression, sometimes the PHY reports link down even if the
+ * device is present because of speed negotiation failure. so need to retry
+ * the COMRESET to get the link up. The following algorithm is followed to
+ * proper configure the hardware PHY during COMRESET:
+ *
+ * Alg Part 1:
+ * 1. Start the PHY at Gen3 speed (default setting)
+ * 2. Issue the COMRESET
+ * 3. If no link, go to Alg Part 3
+ * 4. If link up, determine if the negotiated speed matches the PHY
+ * configured speed
+ * 5. If they matched, go to Alg Part 2
+ * 6. If they do not matched and first time, configure the PHY for the linked
+ * up disk speed and repeat step 2
+ * 7. Go to Alg Part 2
+ *
+ * Alg Part 2:
+ * 1. On link up, if there are any SERR_DISPARITY and SERR_10B_8B_ERR error
+ * reported in the register PORT_SCR_ERR, then reset the PHY receiver line
+ * 2. Go to Alg Part 4
+ *
+ * Alg Part 3:
+ * 1. Check the PORT_SCR_STAT to see whether device presence detected but PHY
+ * communication establishment failed and maximum link down attempts are
+ * less than Max attempts 3 then goto Alg Part 1.
+ * 2. Go to Alg Part 4.
+ *
+ * Alg Part 4:
+ * 1. Clear any pending from register PORT_SCR_ERR.
+ *
+ * NOTE: For the initial version, we will NOT support Gen1/Gen2. In addition
+ * and until the underlying PHY supports an method to reset the receiver
+ * line, on detection of SERR_DISPARITY or SERR_10B_8B_ERR errors,
+ * an warning message will be printed.
+ */
+static int xgene_ahci_do_hardreset(struct ata_link *link,
+ unsigned long deadline, bool *online)
+{
+ const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
+ struct ata_port *ap = link->ap;
+ struct ahci_host_priv *hpriv = ap->host->private_data;
+ struct xgene_ahci_context *ctx = hpriv->plat_data;
+ struct ahci_port_priv *pp = ap->private_data;
+ u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
+ void __iomem *port_mmio = ahci_port_base(ap);
+ struct ata_taskfile tf;
+ int link_down_retry = 0;
+ int rc;
+ u32 val, sstatus;
+
+ do {
+ /* clear D2H reception area to properly wait for D2H FIS */
+ ata_tf_init(link->device, &tf);
+ tf.command = ATA_BUSY;
+ ata_tf_to_fis(&tf, 0, 0, d2h_fis);
+ rc = sata_link_hardreset(link, timing, deadline, online,
+ ahci_check_ready);
+ if (*online) {
+ val = readl(port_mmio + PORT_SCR_ERR);
+ if (val & (SERR_DISPARITY | SERR_10B_8B_ERR))
+ dev_warn(ctx->dev, "link has error\n");
+ break;
+ }
+
+ sata_scr_read(link, SCR_STATUS, &sstatus);
+ } while (link_down_retry++ < MAX_LINK_DOWN_RETRY &&
+ (sstatus & 0xff) == 0x1);
+
+ /* clear all errors if any pending */
+ val = readl(port_mmio + PORT_SCR_ERR);
+ writel(val, port_mmio + PORT_SCR_ERR);
+
+ return rc;
+}
+
+static int xgene_ahci_hardreset(struct ata_link *link, unsigned int *class,
+ unsigned long deadline)
+{
+ struct ata_port *ap = link->ap;
+ struct ahci_host_priv *hpriv = ap->host->private_data;
+ void __iomem *port_mmio = ahci_port_base(ap);
+ bool online;
+ int rc;
+ u32 portcmd_saved;
+ u32 portclb_saved;
+ u32 portclbhi_saved;
+ u32 portrxfis_saved;
+ u32 portrxfishi_saved;
+
+ /* As hardreset resets these CSR, save it to restore later */
+ portcmd_saved = readl(port_mmio + PORT_CMD);
+ portclb_saved = readl(port_mmio + PORT_LST_ADDR);
+ portclbhi_saved = readl(port_mmio + PORT_LST_ADDR_HI);
+ portrxfis_saved = readl(port_mmio + PORT_FIS_ADDR);
+ portrxfishi_saved = readl(port_mmio + PORT_FIS_ADDR_HI);
+
+ hpriv->stop_engine(ap);
+
+ rc = xgene_ahci_do_hardreset(link, deadline, &online);
+
+ /* As controller hardreset clears them, restore them */
+ writel(portcmd_saved, port_mmio + PORT_CMD);
+ writel(portclb_saved, port_mmio + PORT_LST_ADDR);
+ writel(portclbhi_saved, port_mmio + PORT_LST_ADDR_HI);
+ writel(portrxfis_saved, port_mmio + PORT_FIS_ADDR);
+ writel(portrxfishi_saved, port_mmio + PORT_FIS_ADDR_HI);
+
+ hpriv->start_engine(ap);
+
+ if (online)
+ *class = ahci_dev_classify(ap);
+
+ return rc;
+}
+
+static void xgene_ahci_host_stop(struct ata_host *host)
+{
+ struct ahci_host_priv *hpriv = host->private_data;
+
+ ahci_platform_disable_resources(hpriv);
+}
+
+/**
+ * xgene_ahci_pmp_softreset - Issue the softreset to the drives connected
+ * to Port Multiplier.
+ * @link: link to reset
+ * @class: Return value to indicate class of device
+ * @deadline: deadline jiffies for the operation
+ *
+ * Due to H/W errata, the controller is unable to save the PMP
+ * field fetched from command header before sending the H2D FIS.
+ * When the device returns the PMP port field in the D2H FIS, there is
+ * a mismatch and results in command completion failure. The workaround
+ * is to write the pmp value to PxFBS.DEV field before issuing any command
+ * to PMP.
+ */
+static int xgene_ahci_pmp_softreset(struct ata_link *link, unsigned int *class,
+ unsigned long deadline)
+{
+ int pmp = sata_srst_pmp(link);
+ struct ata_port *ap = link->ap;
+ u32 rc;
+ void *port_mmio = ahci_port_base(ap);
+ u32 port_fbs;
+
+ /*
+ * Set PxFBS.DEV field with pmp
+ * value.
+ */
+ port_fbs = readl(port_mmio + PORT_FBS);
+ port_fbs &= ~PORT_FBS_DEV_MASK;
+ port_fbs |= pmp << PORT_FBS_DEV_OFFSET;
+ writel(port_fbs, port_mmio + PORT_FBS);
+
+ rc = ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready);
+
+ return rc;
+}
+
+/**
+ * xgene_ahci_softreset - Issue the softreset to the drive.
+ * @link: link to reset
+ * @class: Return value to indicate class of device
+ * @deadline: deadline jiffies for the operation
+ *
+ * Due to H/W errata, the controller is unable to save the PMP
+ * field fetched from command header before sending the H2D FIS.
+ * When the device returns the PMP port field in the D2H FIS, there is
+ * a mismatch and results in command completion failure. The workaround
+ * is to write the pmp value to PxFBS.DEV field before issuing any command
+ * to PMP. Here is the algorithm to detect PMP :
+ *
+ * 1. Save the PxFBS value
+ * 2. Program PxFBS.DEV with pmp value send by framework. Framework sends
+ * 0xF for both PMP/NON-PMP initially
+ * 3. Issue softreset
+ * 4. If signature class is PMP goto 6
+ * 5. restore the original PxFBS and goto 3
+ * 6. return
+ */
+static int xgene_ahci_softreset(struct ata_link *link, unsigned int *class,
+ unsigned long deadline)
+{
+ int pmp = sata_srst_pmp(link);
+ struct ata_port *ap = link->ap;
+ struct ahci_host_priv *hpriv = ap->host->private_data;
+ struct xgene_ahci_context *ctx = hpriv->plat_data;
+ void *port_mmio = ahci_port_base(ap);
+ u32 port_fbs;
+ u32 port_fbs_save;
+ u32 retry = 1;
+ u32 rc;
+
+ port_fbs_save = readl(port_mmio + PORT_FBS);
+
+ /*
+ * Set PxFBS.DEV field with pmp
+ * value.
+ */
+ port_fbs = readl(port_mmio + PORT_FBS);
+ port_fbs &= ~PORT_FBS_DEV_MASK;
+ port_fbs |= pmp << PORT_FBS_DEV_OFFSET;
+ writel(port_fbs, port_mmio + PORT_FBS);
+
+softreset_retry:
+ rc = ahci_do_softreset(link, class, pmp,
+ deadline, ahci_check_ready);
+
+ ctx->class[ap->port_no] = *class;
+ if (*class != ATA_DEV_PMP) {
+ /*
+ * Retry for normal drives without
+ * setting PxFBS.DEV field with pmp value.
+ */
+ if (retry--) {
+ writel(port_fbs_save, port_mmio + PORT_FBS);
+ goto softreset_retry;
+ }
+ }
+
+ return rc;
+}
+
+/**
+ * xgene_ahci_handle_broken_edge_irq - Handle the broken irq.
+ * @ata_host: Host that recieved the irq
+ * @irq_masked: HOST_IRQ_STAT value
+ *
+ * For hardware with broken edge trigger latch
+ * the HOST_IRQ_STAT register misses the edge interrupt
+ * when clearing of HOST_IRQ_STAT register and hardware
+ * reporting the PORT_IRQ_STAT register at the
+ * same clock cycle.
+ * As such, the algorithm below outlines the workaround.
+ *
+ * 1. Read HOST_IRQ_STAT register and save the state.
+ * 2. Clear the HOST_IRQ_STAT register.
+ * 3. Read back the HOST_IRQ_STAT register.
+ * 4. If HOST_IRQ_STAT register equals to zero, then
+ * traverse the rest of port's PORT_IRQ_STAT register
+ * to check if an interrupt is triggered at that point else
+ * go to step 6.
+ * 5. If PORT_IRQ_STAT register of rest ports is not equal to zero
+ * then update the state of HOST_IRQ_STAT saved in step 1.
+ * 6. Handle port interrupts.
+ * 7. Exit
+ */
+static int xgene_ahci_handle_broken_edge_irq(struct ata_host *host,
+ u32 irq_masked)
+{
+ struct ahci_host_priv *hpriv = host->private_data;
+ void __iomem *port_mmio;
+ int i;
+
+ if (!readl(hpriv->mmio + HOST_IRQ_STAT)) {
+ for (i = 0; i < host->n_ports; i++) {
+ if (irq_masked & (1 << i))
+ continue;
+
+ port_mmio = ahci_port_base(host->ports[i]);
+ if (readl(port_mmio + PORT_IRQ_STAT))
+ irq_masked |= (1 << i);
+ }
+ }
+
+ return ahci_handle_port_intr(host, irq_masked);
+}
+
+static irqreturn_t xgene_ahci_irq_intr(int irq, void *dev_instance)
+{
+ struct ata_host *host = dev_instance;
+ struct ahci_host_priv *hpriv;
+ unsigned int rc = 0;
+ void __iomem *mmio;
+ u32 irq_stat, irq_masked;
+
+ VPRINTK("ENTER\n");
+
+ hpriv = host->private_data;
+ mmio = hpriv->mmio;
+
+ /* sigh. 0xffffffff is a valid return from h/w */
+ irq_stat = readl(mmio + HOST_IRQ_STAT);
+ if (!irq_stat)
+ return IRQ_NONE;
+
+ irq_masked = irq_stat & hpriv->port_map;
+
+ spin_lock(&host->lock);
+
+ /*
+ * HOST_IRQ_STAT behaves as edge triggered latch meaning that
+ * it should be cleared before all the port events are cleared.
+ */
+ writel(irq_stat, mmio + HOST_IRQ_STAT);
+
+ rc = xgene_ahci_handle_broken_edge_irq(host, irq_masked);
+
+ spin_unlock(&host->lock);
+
+ VPRINTK("EXIT\n");
+
+ return IRQ_RETVAL(rc);
+}
+
+static struct ata_port_operations xgene_ahci_v1_ops = {
+ .inherits = &ahci_ops,
+ .host_stop = xgene_ahci_host_stop,
+ .hardreset = xgene_ahci_hardreset,
+ .read_id = xgene_ahci_read_id,
+ .qc_issue = xgene_ahci_qc_issue,
+ .softreset = xgene_ahci_softreset,
+ .pmp_softreset = xgene_ahci_pmp_softreset
+};
+
+static const struct ata_port_info xgene_ahci_v1_port_info = {
+ .flags = AHCI_FLAG_COMMON | ATA_FLAG_PMP,
+ .pio_mask = ATA_PIO4,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &xgene_ahci_v1_ops,
+};
+
+static struct ata_port_operations xgene_ahci_v2_ops = {
+ .inherits = &ahci_ops,
+ .host_stop = xgene_ahci_host_stop,
+ .hardreset = xgene_ahci_hardreset,
+ .read_id = xgene_ahci_read_id,
+};
+
+static const struct ata_port_info xgene_ahci_v2_port_info = {
+ .flags = AHCI_FLAG_COMMON | ATA_FLAG_PMP,
+ .pio_mask = ATA_PIO4,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &xgene_ahci_v2_ops,
+};
+
+static int xgene_ahci_hw_init(struct ahci_host_priv *hpriv)
+{
+ struct xgene_ahci_context *ctx = hpriv->plat_data;
+ int i;
+ int rc;
+ u32 val;
+
+ /* Remove IP RAM out of shutdown */
+ rc = xgene_ahci_init_memram(ctx);
+ if (rc)
+ return rc;
+
+ for (i = 0; i < MAX_AHCI_CHN_PERCTR; i++)
+ xgene_ahci_set_phy_cfg(ctx, i);
+
+ /* AXI disable Mask */
+ writel(0xffffffff, hpriv->mmio + HOST_IRQ_STAT);
+ readl(hpriv->mmio + HOST_IRQ_STAT); /* Force a barrier */
+ writel(0, ctx->csr_core + INTSTATUSMASK);
+ val = readl(ctx->csr_core + INTSTATUSMASK); /* Force a barrier */
+ dev_dbg(ctx->dev, "top level interrupt mask 0x%X value 0x%08X\n",
+ INTSTATUSMASK, val);
+
+ writel(0x0, ctx->csr_core + ERRINTSTATUSMASK);
+ readl(ctx->csr_core + ERRINTSTATUSMASK); /* Force a barrier */
+ writel(0x0, ctx->csr_axi + INT_SLV_TMOMASK);
+ readl(ctx->csr_axi + INT_SLV_TMOMASK);
+
+ /* Enable AXI Interrupt */
+ writel(0xffffffff, ctx->csr_core + SLVRDERRATTRIBUTES);
+ writel(0xffffffff, ctx->csr_core + SLVWRERRATTRIBUTES);
+ writel(0xffffffff, ctx->csr_core + MSTRDERRATTRIBUTES);
+ writel(0xffffffff, ctx->csr_core + MSTWRERRATTRIBUTES);
+
+ /* Enable coherency */
+ val = readl(ctx->csr_core + BUSCTLREG);
+ val &= ~0x00000002; /* Enable write coherency */
+ val &= ~0x00000001; /* Enable read coherency */
+ writel(val, ctx->csr_core + BUSCTLREG);
+
+ val = readl(ctx->csr_core + IOFMSTRWAUX);
+ val |= (1 << 3); /* Enable read coherency */
+ val |= (1 << 9); /* Enable write coherency */
+ writel(val, ctx->csr_core + IOFMSTRWAUX);
+ val = readl(ctx->csr_core + IOFMSTRWAUX);
+ dev_dbg(ctx->dev, "coherency 0x%X value 0x%08X\n",
+ IOFMSTRWAUX, val);
+
+ return rc;
+}
+
+static int xgene_ahci_mux_select(struct xgene_ahci_context *ctx)
+{
+ u32 val;
+
+ /* Check for optional MUX resource */
+ if (!ctx->csr_mux)
+ return 0;
+
+ val = readl(ctx->csr_mux + SATA_ENET_CONFIG_REG);
+ val &= ~CFG_SATA_ENET_SELECT_MASK;
+ writel(val, ctx->csr_mux + SATA_ENET_CONFIG_REG);
+ val = readl(ctx->csr_mux + SATA_ENET_CONFIG_REG);
+ return val & CFG_SATA_ENET_SELECT_MASK ? -1 : 0;
+}
+
+static struct scsi_host_template ahci_platform_sht = {
+ AHCI_SHT(DRV_NAME),
+};
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id xgene_ahci_acpi_match[] = {
+ { "APMC0D0D", XGENE_AHCI_V1},
+ { "APMC0D32", XGENE_AHCI_V2},
+ {},
+};
+MODULE_DEVICE_TABLE(acpi, xgene_ahci_acpi_match);
+#endif
+
+static const struct of_device_id xgene_ahci_of_match[] = {
+ {.compatible = "apm,xgene-ahci", .data = (void *) XGENE_AHCI_V1},
+ {.compatible = "apm,xgene-ahci-v2", .data = (void *) XGENE_AHCI_V2},
+ {},
+};
+MODULE_DEVICE_TABLE(of, xgene_ahci_of_match);
+
+static int xgene_ahci_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct ahci_host_priv *hpriv;
+ struct xgene_ahci_context *ctx;
+ struct resource *res;
+ const struct of_device_id *of_devid;
+ enum xgene_ahci_version version = XGENE_AHCI_V1;
+ const struct ata_port_info *ppi[] = { &xgene_ahci_v1_port_info,
+ &xgene_ahci_v2_port_info };
+ int rc;
+
+ hpriv = ahci_platform_get_resources(pdev, 0);
+ if (IS_ERR(hpriv))
+ return PTR_ERR(hpriv);
+
+ ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ hpriv->plat_data = ctx;
+ ctx->hpriv = hpriv;
+ ctx->dev = dev;
+
+ /* Retrieve the IP core resource */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ ctx->csr_core = devm_ioremap_resource(dev, res);
+ if (IS_ERR(ctx->csr_core))
+ return PTR_ERR(ctx->csr_core);
+
+ /* Retrieve the IP diagnostic resource */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+ ctx->csr_diag = devm_ioremap_resource(dev, res);
+ if (IS_ERR(ctx->csr_diag))
+ return PTR_ERR(ctx->csr_diag);
+
+ /* Retrieve the IP AXI resource */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 3);
+ ctx->csr_axi = devm_ioremap_resource(dev, res);
+ if (IS_ERR(ctx->csr_axi))
+ return PTR_ERR(ctx->csr_axi);
+
+ /* Retrieve the optional IP mux resource */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 4);
+ if (res) {
+ void __iomem *csr = devm_ioremap_resource(dev, res);
+ if (IS_ERR(csr))
+ return PTR_ERR(csr);
+
+ ctx->csr_mux = csr;
+ }
+
+ of_devid = of_match_device(xgene_ahci_of_match, dev);
+ if (of_devid) {
+ if (of_devid->data)
+ version = (enum xgene_ahci_version) of_devid->data;
+ }
+#ifdef CONFIG_ACPI
+ else {
+ const struct acpi_device_id *acpi_id;
+ struct acpi_device_info *info;
+ acpi_status status;
+
+ acpi_id = acpi_match_device(xgene_ahci_acpi_match, &pdev->dev);
+ if (!acpi_id) {
+ dev_warn(&pdev->dev, "No node entry in ACPI table. Assume version1\n");
+ version = XGENE_AHCI_V1;
+ } else if (acpi_id->driver_data) {
+ version = (enum xgene_ahci_version) acpi_id->driver_data;
+ status = acpi_get_object_info(ACPI_HANDLE(&pdev->dev), &info);
+ if (ACPI_FAILURE(status)) {
+ dev_warn(&pdev->dev, "%s: Error reading device info. Assume version1\n",
+ __func__);
+ version = XGENE_AHCI_V1;
+ } else {
+ if (info->valid & ACPI_VALID_CID)
+ version = XGENE_AHCI_V2;
+ kfree(info);
+ }
+ }
+ }
+#endif
+
+ dev_dbg(dev, "VAddr 0x%p Mmio VAddr 0x%p\n", ctx->csr_core,
+ hpriv->mmio);
+
+ /* Select ATA */
+ if ((rc = xgene_ahci_mux_select(ctx))) {
+ dev_err(dev, "SATA mux selection failed error %d\n", rc);
+ return -ENODEV;
+ }
+
+ if (xgene_ahci_is_memram_inited(ctx)) {
+ dev_info(dev, "skip clock and PHY initialization\n");
+ goto skip_clk_phy;
+ }
+
+ /* Due to errata, HW requires full toggle transition */
+ rc = ahci_platform_enable_clks(hpriv);
+ if (rc)
+ goto disable_resources;
+ ahci_platform_disable_clks(hpriv);
+
+ rc = ahci_platform_enable_resources(hpriv);
+ if (rc)
+ goto disable_resources;
+
+ /* Configure the host controller */
+ xgene_ahci_hw_init(hpriv);
+skip_clk_phy:
+
+ switch (version) {
+ case XGENE_AHCI_V1:
+ hpriv->flags = AHCI_HFLAG_NO_NCQ;
+ break;
+ case XGENE_AHCI_V2:
+ hpriv->flags |= AHCI_HFLAG_YES_FBS;
+ hpriv->irq_handler = xgene_ahci_irq_intr;
+ break;
+ default:
+ break;
+ }
+
+ rc = ahci_platform_init_host(pdev, hpriv, ppi[version - 1],
+ &ahci_platform_sht);
+ if (rc)
+ goto disable_resources;
+
+ dev_dbg(dev, "X-Gene SATA host controller initialized\n");
+ return 0;
+
+disable_resources:
+ ahci_platform_disable_resources(hpriv);
+ return rc;
+}
+
+static struct platform_driver xgene_ahci_driver = {
+ .probe = xgene_ahci_probe,
+ .remove = ata_platform_remove_one,
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = xgene_ahci_of_match,
+ .acpi_match_table = ACPI_PTR(xgene_ahci_acpi_match),
+ },
+};
+
+module_platform_driver(xgene_ahci_driver);
+
+MODULE_DESCRIPTION("APM X-Gene AHCI SATA driver");
+MODULE_AUTHOR("Loc Ho <lho@apm.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("0.4");